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<pre><code>[root@bogon-29 ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-09-18 13:05:45 CST; 1 weeks 4 days ago
     Docs: man:firewalld(1)
 Main PID: 772 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─772 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid

Sep 18 13:05:38 localhost.localdomain systemd[1]: Starting firewalld - dynamic firewall daemon...
Sep 18 13:05:45 localhost.localdomain systemd[1]: Started firewalld - dynamic firewall daemon.
</code></pre>

<h5>查看状态</h5>
<pre><code>[root@bogon-29 ~]# firewall-cmd --state
running
</code></pre>

<h5>查询3306端口是否开放</h5>
<pre><code>[root@bogon-28 ~]# firewall-cmd --query-port=3306/tcp
no
</code></pre>

<h5>开放3306端口</h5>
<pre><code>[root@bogon-28 ~]# firewall-cmd --permanent --add-port=3306/tcp
success
</code></pre>

<h5>重启防火墙(修改配置后要重启防火墙)</h5>
<pre><code>[root@bogon-28 ~]# firewall-cmd --reload
success
</code></pre>

<h5>移除端口</h5>
<pre><code>[root@bogon-28 ~]# firewall-cmd --permanent --remove-port=8080/tcp
</code></pre>

<h5>参数解释</h5>
<pre><code>1、firwall-cmd：是Linux提供的操作firewall的一个工具；
2、--permanent：表示设置为持久；
3、--add-port：标识添加的端口；
</code></pre>

<h4>CentOS7使用firewalld打开关闭防火墙与端口</h4>
<h5>1、firewalld的基本使用</h5>
<pre><code>启动： systemctl start firewalld
关闭： systemctl stop firewalld
查看状态： systemctl status firewalld 
开机禁用  ： systemctl disable firewalld
开机启用  ： systemctl enable firewalld
</code></pre>

<h5>2.systemctl是CentOS7的服务管理工具中主要的工具，它融合之前service和chkconfig的功能于一体。</h5>
<pre><code>启动一个服务：systemctl start firewalld.service
关闭一个服务：systemctl stop firewalld.service
重启一个服务：systemctl restart firewalld.service
显示一个服务的状态：systemctl status firewalld.service
在开机时启用一个服务：systemctl enable firewalld.service
在开机时禁用一个服务：systemctl disable firewalld.service
查看服务是否开机启动：systemctl is-enabled firewalld.service
查看已启动的服务列表：systemctl list-unit-files|grep enabled
查看启动失败的服务列表：systemctl --failed
</code></pre>

<h5>3.配置firewalld-cmd</h5>
<pre><code>查看版本： firewall-cmd --version
查看帮助： firewall-cmd --help
显示状态： firewall-cmd --state
查看所有打开的端口： firewall-cmd --zone=public --list-ports
更新防火墙规则： firewall-cmd --reload
查看区域信息:  firewall-cmd --get-active-zones
查看指定接口所属区域： firewall-cmd --get-zone-of-interface=eth0
拒绝所有包：firewall-cmd --panic-on
取消拒绝状态： firewall-cmd --panic-off
查看是否拒绝： firewall-cmd --query-panic

那怎么开启一个端口呢
添加
firewall-cmd --zone=public --add-port=80/tcp --permanent    （--permanent永久生效，没有此参数重启后失效）
重新载入
firewall-cmd --reload
查看
firewall-cmd --zone= public --query-port=80/tcp
删除
firewall-cmd --zone= public --remove-port=80/tcp --permanent
</code></pre>


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